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After they were confronted by the warlockNicholas in 1999, the sisters traveled back in time to 1975 to prevent their mother from making a deal with the warlock. After they obtained his ring that made him immune to their powers, Penny and Patty attempted to send them back. However, the spell failed as it required the Power of Three. A pregnant Patty then cast the spell with the little Prue and Piper and managed to send them back.

Duncan was able to cast the spell, where it previously required The Power of Three. However, this was due to the fact that the Power of Three was required to the Charmed Ones to travel back in time, and Duncan's own power alone conjured Lady Godiva. Hence, the power needed to use this spell, must match or exceed the power used to make the event happen.